The implications both technical and economic for the water and agricultural industries in England and Wales of a range of policy measures proposed for solving the nitrate problem

angleterre calidad del agua cropping systems eau souterraine england environmental policies fertilizer industry groundwater industria de abonos industrie des engrais inglaterra land use lutte antipollution nitrate nitrates nitratos politique de l'environnement pollution control pollution de l'eau reglamentaciones regulations sistemas de cultivo utilisation des terres water pollution water quality